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Method for repairing oxygen defect in preparation process of spinel lithium manganate as lithium-ion cathode material

A cathode material, lithium manganate technology, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as capacity decay and few structural defects

Active Publication Date: 2014-11-05
QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of lithium manganese oxide as the positive electrode material of lithium-ion secondary batteries is that the capacity fading is relatively serious. The main reasons for the capacity fading are: the Jahn-Teller effect in the charging and discharging process, the dissolution of Mn in the electrolyte and the presence of Mn in the structure. oxygen deficiency
[0003] At present, there have been a lot of studies on stabilizing the spinel structure and improving its electrochemical performance by doping anions and cations, but there are few related studies on the structural defects of the material itself.

Method used

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  • Method for repairing oxygen defect in preparation process of spinel lithium manganate as lithium-ion cathode material
  • Method for repairing oxygen defect in preparation process of spinel lithium manganate as lithium-ion cathode material
  • Method for repairing oxygen defect in preparation process of spinel lithium manganate as lithium-ion cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh 693g of lithium carbonate, 101g of aluminum hydroxide, and 3192g of electrolytic manganese dioxide and put them into a horizontal ball mill tank for rough mixing for 30 minutes.

[0023] (2) Sieve out the zirconium balls, put them into an automatic granulator and mix them finely for 20 minutes.

[0024] (3) After fine mixing, directly add 5% PVA in the granulator to granulate, and the moisture content in the material is 13%.

[0025] (4) After the granulated material is dried, pour it into the material bowl and put it into the atmosphere furnace for one-time calcination.

[0026] (5) After the primary sintering is completed, the particles are disintegrated, 35 g of lithium carbonate is added, mixed evenly, and the secondary calcination is carried out to obtain the final powder product.

[0027] (6) Do XRD, SEM and electrical performance analysis tests on the powder, the results are as follows Figure 1-Figure 4 shown.

Embodiment 2

[0029] (1) Weigh 693g of lithium carbonate, 101g of aluminum hydroxide, and 3192g of electrolytic manganese dioxide and put them into a horizontal ball mill tank for rough mixing for 30 minutes.

[0030] (2) Sieve out the zirconium balls, put them into an automatic granulator and mix them finely for 20 minutes.

[0031] (3) After fine mixing, directly add 3% PVA in the granulator to granulate, and the moisture content in the material is 16%.

[0032] (4) After the granulated material is dried, pour it into the material bowl and put it into the atmosphere furnace for one-time calcination.

[0033] (5) After the primary sintering is completed, the particles are disintegrated, 35 g of lithium carbonate is added, mixed evenly, and the secondary calcination is carried out to obtain the final powder product.

[0034] (6) Test the product.

Embodiment 3

[0036] (1) Weigh 728g of lithium carbonate, 101g of aluminum hydroxide, and 3192g of electrolytic manganese dioxide and put them into a horizontal ball mill tank for rough mixing for 30 minutes.

[0037] (2) Sieve out the zirconium balls, put them into an automatic granulator and mix them finely for 20 minutes.

[0038] (3) After fine mixing, directly add 5% PVA in the granulator to granulate, and the moisture content in the material is 13%.

[0039] (4) After the granulated material is dried, pour it into the material bowl and put it into the atmosphere furnace for one-time calcination.

[0040] (5) After the primary sintering is completed, the particles are disintegrated and subjected to secondary calcination to obtain the final powder product.

[0041] (6) Analyze and test the powder.

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Abstract

The invention discloses a method for repairing oxygen defect in a preparation process of spinel lithium manganate as a lithium-ion cathode material. The method comprises the following steps: (1) taking lithium carbonate and electrolytic manganese dioxide as main reaction substances and doping with aluminium hydroxide; (2) weighing reactants in proportion and putting the reactants in a horizontal-type ball mill tank for coarsely mixing; (3) putting the coarsely mixed materials into an automatic granulator for finely mixing and directly granulating the materials in the granulator after finely mixing; (4) putting the granulated materials in a drying oven for drying and putting the dried granulated materials into an atmosphere furnace for calcining for the first time; and (5) smashing the calcined materials, supplementing the lithium and carrying out secondary calcining. With the adoption of the method, the material performance is improved; and the preparation process is simple and easy in operation; the raw materials are easily available; and the obtained product is uniform.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a method for repairing oxygen defects in the preparation process of spinel-type lithium manganese oxide, a lithium-ion cathode material. Background technique [0002] Lithium manganese oxide is recognized as one of the most promising cathode materials for lithium-ion secondary batteries for electric vehicles or hybrid electric vehicles due to its rich manganese resources, low price, environmental friendliness and high safety. The biggest disadvantage of lithium manganese oxide as the positive electrode material of lithium-ion secondary batteries is that the capacity fading is relatively serious. The main reasons for the capacity fading are: the Jahn-Teller effect occurs during the charging and discharging process, Mn dissolves in the electrolyte and exists in the structure. oxygen deficiency. [0003] At present, there have been a lot of studies on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505
CPCY02E60/122Y02E60/10
Inventor 孙琦张连君孙慧英
Owner QINGDAO QIANYUN HIGH TECH NEW MATERIAL
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